On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive). On a conventional, non-articulated locomotive, the driving wheels are all coupled together with side rods (also known as coupling rods); normally one pair is directly driven by the main rod, or connecting rod, which is connected to the end of the piston rod; power is transmitted to the others through the side rods.
On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive). On a conventional, non-articulated locomotive, the driving wheels are all coupled together with side rods (also known as coupling rods); normally one pair is directly driven by the main rod, or connecting rod, which is connected to the end of the piston rod; power is transmitted to the others through the side rods.
Source: Wikipedia "Driving wheel" · CC BY-SA 4.0
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